A at (not spherical) tissue engineered skin (thickness 3 mm) is attached to the bottom of a dish and cultured with cell media atop it (which has an oxygen concentration of 0.15 moI/m3). The diffusivity of oxygen in the skin is 3 E9 mZ/s, and according to experiments that you've performed, you want to make sure that the concentration of oxygen in the device doesn't fall below 0.06 moi/m3. (Below that concentration harms the cells.) The rate of oxygen consumption is -5.7 E-17 moi/[cellos]. What is the maximum cellularity (in cells/mL, three signicant digits) that this tissue engineered skin can support